Which two month in a year have same calendar ?

April – November  October – December  January - October January - March

January - October

January - October are two month in a year have same calender. So, Option (c) is correct. Because those two months which have the same code have the same calendar. Code for     Jan – 0         Feb – 3        Mar – 3 Apr – 6        May – 1       June – 4 July – 6        Aug – 2       Sep – 5 Oct – 0         Nov – 3       Dec – 5